IOS中UIWebView加载Loading的实现方法

最近有朋友问我类似微信语音播放的喇叭动画和界面图片加载loading界面是怎样实现的，是不是就是一个gif图片呢！我的回答当然是否定了，当然不排除也有人用gif图片啊！  

第一种方法：使用UIView and UIActivityIndicatorView

 

复制代码
//创建UIWebView
WebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 44, 320, 400)];
[WebView setUserInteractionEnabled:NO];
[WebView setBackgroundColor:[UIColor clearColor]];
[WebView setDelegate:self];
[WebView setOpaque:NO];//使网页透明
NSString *path = @"http://www.easck.com/> NSURL *url = [NSURL URLWithString:path];
[WebView loadRequest:[NSURLRequest requestWithURL:url]];
//创建UIActivityIndicatorView背底半透明View   
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[view setTag:103];
[view setBackgroundColor:[UIColor blackColor]];
[view setAlpha:0.8];
[self.view addSubview:view];
activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];
[activityIndicator setCenter:view.center];
[activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];
[view addSubview:activityIndicator];
[self.view addSubview:WebView];
[view release];
[WebView release];
//开始加载数据
- (void)webViewDidStartLoad:(UIWebView *)webView {   
      [activityIndicator startAnimating];        
}
//数据加载完
- (void)webViewDidFinishLoad:(UIWebView *)webView {
     [activityIndicator stopAnimating];   
     UIView *view = (UIView *)[self.view viewWithTag:103];
     [view removeFromSuperview];
}

 

第二种方法：使用UIAlertView and UIActivityIndicatorView

 

复制代码
//加载网页动画
- (void)webViewDidStartLoad:(UIWebView *)webView{
    if (myAlert==nil){       
       myAlert = [[UIAlertView alloc] initWithTitle:nil
                                                              message: @"读取中..."